Tariffs do not slow our economy down at all. Tariffs reduce demand for foreign goods which has no effect here. We took the unemployment/economic hit up front when we offshored and did the creative destructive thing. I guess closing factories and laying off millions had no effect on the economy at least according to you..
Tariffs and the decrease in demand only affects workers in places we import from. It stimulates our economy with domestic industries reopening, construction of new plants and hiring of factory workers. Tariffs would cause and an economic bonanza here. Again you have it backwards.
In your world there is no such thing as Supply and Demand. Tariffs increase prices which cuts demand leading to over supply.
Cutting our international trade hurts our economy in many ways, not the least of which is a restriction on the Division of Labor leading to higher costs because too little is produced.
The Export Multiplier is positive.
Tariffs do not stand alone or get passed without retaliation. It is a pissing match between skunks.
Your ideas of the costs and benefits of tariffs are ass-backward and would require the disappearance of the laws of economic life.